The UI is improved and previous apps like Minimove, Photo Collage and Do it later apps are removed. (dealntech.com)
Holding down the back button still opens the task switching interface, but instead of previous apps appearing to the left based on the sequence that you had used them, they now appear to the right. (pocketnow.com)
The update brings improved Focus Assist, a new Timeline feature for recalling previous apps you were working on across machines. (fonearena.com)